package cn.stylefeng.guns.modular.demos.util;

import java.io.IOException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.binary.Base64;

public class DesUtils {

    private final static String DES = "DES";

    public static final String KEY = "sm3a3f07881cf7b65494e30cc8d7";

    /**
     * Description 根据键值进行加密
     * 
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    public static String encrypt(String data, String key) throws Exception {
        byte[] bt = encrypt(data.getBytes(), key.getBytes());
        String strs = Base64.encodeBase64String(bt);
        return strs;
    }

    /**
     * Description 根据键值进行解密
     * 
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decrypt(String data, String key) throws IOException, Exception {
        if (data == null) return null;
        byte[] buf = Base64.decodeBase64(data);
        byte[] bt = decrypt(buf, key.getBytes());
        return new String(bt);
    }

    /**
     * Description 根据键值进行加密
     * 
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    /**
     * Description 根据键值进行解密
     * 
     * @param data
     * @param key
     *            加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();

        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);

        // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);

        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);

        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);

        return cipher.doFinal(data);
    }

    //测试
    public static void main(String args[]) throws Exception {
        //待加密内容
        String str = "{\"coreCustNo\":\"1019332397\",\"pt\":\"13964147824\"}";
        str = URLEncoder.encode(str, "UTF-8");

        String result = DesUtils.encrypt(str, KEY);
        System.out.println("加密后：" + new String(result));
        result = URLEncoder.encode(result, "UTF-8");
        //bizContentReq 使用加密后再encode的数据
        System.out.println("加密后再encode：" + new String(result));
        //直接将如上内容解密
        try {
            result = URLDecoder.decode(result, "UTF8");
            String decryResult = DesUtils.decrypt(result, KEY);
            decryResult = URLDecoder.decode(decryResult, "UTF8");
            System.out.println("解密后：" + decryResult);
        } catch (Exception e1) {
            e1.printStackTrace();
        }
        
        System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++");
        System.out.println("++++++++++++++++++++++++++++++++++++++++++++++++");
        try {
        	result = "avYYq7DDt%2BeUwx8J2%2B6%2FFqorq9Fb2c85JqHIPhJPUGn%2BOX7scF30QAqT395gCdpk";
            result = URLDecoder.decode(result, "UTF8");
            String decryResult = DesUtils.decrypt(result, KEY);
            decryResult = URLDecoder.decode(decryResult, "UTF8");
            System.out.println("解密后：" + decryResult);
        } catch (Exception e1) {
            e1.printStackTrace();
        }
        

    }

}
